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FOREWORD
The HYOSUNG GF 125 was designed to offer superior performance through light weight design and four
stroke power. The new GF 125 represents another major advance by HYOSUNG in four stroke motorcyles.
This service manual has been produced primarily for experienced mechanics whose job is to inspect, adjust,
repair and service HYOSUNG Motorcycles. Apprentice mechanics and "do it yourself"mechanics will also find
this manual to be an extremely useful guide.
Model GF 125 manufactured to standard specifcations is the main subject matter of this manual. However,
the GF 125 machines distributed in your country might differ in minor respects from the standard-specifica-
tion GF 125 and, if they do, if is because some minor modifications (Which are of no consequence in most
cases as far as servicing is concerd) had to be made to comply with the statutry requirments of your coun-
try.
This manual contains up-to-date information at the time of its issue. Latermade modifications and changes
will be explanied to each HYOSUNG distributor in respective markets, to whom you are requested to make
query about updated information, if any.
HYOSUNG MOTORS & MACHINERY INC.
� COPYRIGHT HYOSUNG MOTORS & MACHINERY INC.
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Summary of Contents for HYOSUNG GF 125
- Page 1 GF 125 machines distributed in your country might differ in minor respects from the standard-specifica- tion GF 125 and, if they do, if is because some minor modifications (Which are of no consequence in most cases as far as servicing is concerd) had to be made to comply with the statutry requirments of your coun- try.
- Page 2 GROUP INDEX GENERAL INFORMATION PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES SERVICING ENGINE FUEL AND LUBRICATION SYSTEM ELECTRICAL SYSTEM CHASSIS SERVICING INFORMATION...
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Page 4: Table Of Contents
GENERAL INFORMATION CONTENTS SERIAL NUMBER LOCATIONS FUEL AND OIL RECOMMENDATIONS BREAK-IN PROCEDURE SPECIAL FEATURES SPECIAL MATERIALS PRECAUTIONS AND GENERAL INSTRUCTIONS SPECIFICATIONS... -
Page 5: Serial Number Locations
1-1 GENERAL INFORMA TION SERIAL NUMBER LOCATIONS ENGINE OIL Be sure that the engine-oil you use comes under API The frame serial number ① is stamped on the rear end classification of SF or SG and that its vicosity rating is of the frame. -
Page 6: Special Features
GENERAL INFORMA TION 1-2 SPECIAL FEATURES HYOSUNG GF 125 is a improved model that has been revised from 2 valve evgine of GF 125 to 4 valve engine and has much more developed features as follows. 1. IMPROVEMENT OF ENGINE POWER AT MIDDLE AND LOW SPEEDS... - Page 7 1-3 GENERAL INFORMA TION 3. CLUTCH MISSION The Primary Gear Ratio is improved from 3.47 to 3.50 in order to increase rotation. For improving CLUTCH durability while long distance driving, CLUTCH DAMPER is changed from rubber to steel Spring type. 4.
- Page 8 IGNITION SYSTEM DESCRIPTION The GF 125 Engine is equipped with a new type ignition system. This new system further reduces timing fluctuations. It has an “ignition timing control circuit”wich accurately controls the advance curve and maintains consistent timing independent of high RPM fluctuation, magnetic force, temperature, and air gap.
- Page 9 1-5 GENERAL INFORMA TION Θ 360� Pick-up Coil Current ① Signal current to SCR Engine speed Below N Θ ② Between N and N Θ ③ Over N Fig. 2 Θ Engine speed(r/min) Fig. 3...
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Page 10: Special Materials
GENERAL INFORMA TION 1-6 SPECIAL MATERIALS The materials listed below are needed for maintenance work on the GF 125 and should be kept on hand for ready use. These items supplement such standard materials as cleaning fluids, lubricants, emery cloth and the like. - Page 11 1-7 GENERAL INFORMA TION Material part part page page ● 2nd drive gear 3-42 ● Starter clutch allen bolt 3-51 THREAD LOCK SUPER “1303B” 99000-32030 ● Front fork damper rod bolts 6-10 THREAD LOCK CEMENT 99000-32040 ● Countershaft bearing 3-42 retainer screws ●...
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Page 12: Precautions And General Instructions
To replace any part of the machine, use a genuine HYOSUNG replacement part. Imitation parts or parts sup- plied from any other source than HYOSUNG if used to replace HYOSUNG parts, can reduce the machine’ s per- formance and, even worse, could induce costly mechani-... -
Page 13: Specifications
1-9 GENERAL INFORMA TION SPECIFICATIONS DIMENSIONS AND DRY MASS Overall length ………………………………………………………… 1,968㎜ Overall width…………………………………………………………… 763㎜ Overall height ………………………………………………………… 1,073㎜ Wheel base …………………………………………………………… 1,292㎜ Ground clearance……………………………………………………… 195㎜ Dry mass ……………………………………………………………… 125㎏ ENGINE Type …………………………………………………………………… Four-strock, air-cooled, OHC Number of cylinder …………………………………………………… 1 Bore ……………………………………………………………………... - Page 14 GENERAL INFORMA TION 1-10 ELECTRICAL Ignition type …………………………………………………………… CDI TYPE Ignition timing ………………………………………………………… 15�B.T.D.C. below 2,250r/min and 35�B.T.D.C. above 4,000r/min Spark plug……………………………………………………………… C8EH-9 Battery ………………………………………………………………… 12V9Ah Headlight ……………………………………………………………… 35/35W Tail/Brake light………………………………………………………… 10/5W×2 Turn signal light ……………………………………………………… 10W Neutral indicator light ………………………………………………… 3W High beam indicator light ……………………………………………...